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Vulnerability of Linux kernel: privilege escalation via Coalesced MMIO

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via Coalesced MMIO of the Linux kernel, in order to escalate his privileges on the host system.
Vulnerable software: Debian, Fedora, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 20/09/2019.
Références of this computer vulnerability: 1746708, CERTFR-2019-AVI-466, CERTFR-2019-AVI-502, CERTFR-2019-AVI-503, CERTFR-2019-AVI-518, CERTFR-2019-AVI-519, CERTFR-2019-AVI-522, CERTFR-2019-AVI-527, CERTFR-2019-AVI-561, CERTFR-2019-AVI-575, CERTFR-2019-AVI-592, CERTFR-2019-AVI-612, CERTFR-2019-AVI-621, CERTFR-2019-AVI-635, CERTFR-2019-AVI-644, CERTFR-2020-AVI-029, CERTFR-2020-AVI-056, CVE-2019-14821, DLA-1930-1, DLA-1940-1, DSA-4531-1, FEDORA-2019-15e141c6a7, FEDORA-2019-a570a92d5a, openSUSE-SU-2019:2307-1, openSUSE-SU-2019:2308-1, RHSA-2019:3309-01, RHSA-2019:3517-01, RHSA-2019:3978-01, RHSA-2019:3979-01, RHSA-2019:4154-01, RHSA-2019:4256-01, RHSA-2020:0027-01, RHSA-2020:0204-01, SSA:2019-311-01, SUSE-SU-2019:14218-1, SUSE-SU-2019:2648-1, SUSE-SU-2019:2651-1, SUSE-SU-2019:2658-1, SUSE-SU-2019:2706-1, SUSE-SU-2019:2710-1, SUSE-SU-2019:2879-1, SUSE-SU-2019:2949-1, SUSE-SU-2019:2950-1, SUSE-SU-2019:2984-1, SUSE-SU-2019:3200-1, SUSE-SU-2019:3295-1, SUSE-SU-2020:0093-1, USN-4157-1, USN-4157-2, USN-4162-1, USN-4162-2, USN-4163-1, USN-4163-2, VIGILANCE-VUL-30379.

Description of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via Coalesced MMIO of the Linux kernel, in order to escalate his privileges on the host system.
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This vulnerability announce impacts software or systems such as Debian, Fedora, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity threat is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this computer threat bulletin.

Solutions for this threat 

Linux kernel: version 5.3.1.
The version 5.3.1 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.3.1.tar.xz

Linux kernel: version 5.2.17.
The version 5.2.17 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.2.17.tar.xz

Linux kernel: version 4.19.75.
The version 4.19.75 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.19.75.tar.xz

Linux kernel: version 4.14.146.
The version 4.14.146 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.146.tar.xz

Linux kernel: version 4.9.194.
The version 4.9.194 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.194.tar.xz

Linux kernel: version 4.4.194.
The version 4.4.194 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.194.tar.xz

Linux kernel: version 3.16.74.
The version 3.16.74 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.16.74.tar.xz

Linux kernel: patch for Coalesced MMIO.
A patch is indicated in information sources.

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.189-3+deb9u1~deb8u1

Debian 8: new linux packages.
New packages are available:
  Debian 8: linux 3.16.74-1

Debian 9, 10: new linux packages.
New packages are available:
  Debian 9: linux 4.9.189-3+deb9u1
  Debian 10: linux 4.19.67-2+deb10u1

Fedora 29: new kernel-headers packages.
New packages are available:
  Fedora 29: kernel-headers 5.2.17-100.fc29

Fedora 29: new kernel packages.
New packages are available:
  Fedora 29: kernel 5.2.17-100.fc29

Fedora 29: new kernel-tools packages.
New packages are available:
  Fedora 29: kernel-tools 5.2.17-100.fc29

Fedora 30: new kernel-headers packages.
New packages are available:
  Fedora 30: kernel-headers 5.2.16-200.fc30

Fedora 30: new kernel packages.
New packages are available:
  Fedora 30: kernel 5.2.16-200.fc30

openSUSE Leap 15: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.76.1
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.20.1

RHEL 6: new kernel packages.
New packages are available:
  RHEL 6.0-6.10: kernel 2.6.32-754.25.1.el6

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.7: kernel-alt 4.14.0-115.16.1.el7a

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7.0-7.7: kernel 3.10.0-1062.7.1.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.7: kernel-rt 3.10.0-1062.7.1.rt56.1030.el7

RHEL 7: new kpatch-patch packages.
New packages are available:
  RHEL 7.0-7.7: kpatch-patch 3_10_0-1062-1-11.el7

RHEL 8.0: new kernel packages.
New packages are available:
  RHEL 8.0: kernel 4.18.0-80.15.1.el8_0

RHEL 8: new kernel packages.
New packages are available:
  RHEL 8: kernel 4.18.0-147.el8

RHEL 8: new kernel-rt packages.
New packages are available:
  RHEL 8: kernel-rt 4.18.0-147.rt24.93.el8

Slackware 14.2: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.199-*-1

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.108.1

SUSE LE 12 SP1: new kernel packages (13/11/2019).
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.124.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.125.1

SUSE LE 12 SP3: new kernel packages (13/11/2019).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.107.1

SUSE LE 12 SP4: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.26.1

SUSE LE 12 SP4: new kernel packages (04/11/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.37.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.7.1

SUSE LE 12 SP5: new kernel packages (09/12/2019).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.7.1

SUSE LE 15: new kernel-azure packages.
New packages are available:
  SUSE LE 15 RTM: kernel-azure 4.12.14-5.41.1
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.16.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.38.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.21.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.14.3

Ubuntu 19.04: new linux-image-5.0.0 packages.
New packages are available:
  Ubuntu 19.04: linux-image-generic 5.0.0.32.33
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.0.0.32.89

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1061.47
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.66.86
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.66.68

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.166.174
  Ubuntu 14.04 ESM: linux-image-aws 4.4.0.1056.57

Wind River Linux: version 10.18.44.12.
The version 10.18.44.12 is fixed:
  https://support2.windriver.com/
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